在过量氧气中用丙烯低温 SCR 去除 NO 的性能和机理研究。
Performance and mechanism study for low-temperature SCR of NO with propylene in excess oxygen over Pt/TiO2 catalyst.
机构信息
Research Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, China.
出版信息
J Environ Sci (China). 2010;22(9):1441-6. doi: 10.1016/s1001-0742(09)60273-4.
A 0.5 wt.% Pt/TiO2 catalyst was prepared and used for the low-temperature selective catalytic reduction (SCR) of NO with C3H6 in the presence of excess oxygen. The effects of Pt loading and O2 concentration on Pt/TiO2 catalytic performance for low-temperature SCR were investigated. It was found that optimal Pt loading was 0.5 wt.% and excess O2 favored low-temperature SCR of NOx. The mechanism of low-temperature SCR of NO with C3H6 was investigated with respect to the behavior of adsorbed species over Pt/TiO2 at 150 degrees C using in situ DRIFTS. The results indicated that surface nitrosyl species (Ptdelta(+)-NO and Ti3(+)-NO) and Pt2(+)-CO are main reaction intermediates during the interactions of NO, C3H6 and O2. A simplified NO decomposition mechanism for the low-temperature SCR of NO with C3H6 was proposed.
制备了 0.5wt.%Pt/TiO2 催化剂，并将其用于在富氧条件下 C3H6 低温选择性催化还原（SCR）NO。考察了 Pt 负载量和 O2 浓度对 Pt/TiO2 低温 SCR 催化性能的影响。结果表明，最佳 Pt 负载量为 0.5wt.%，过量 O2 有利于 NOx 的低温 SCR。采用原位 DRIFTS 技术，在 150°C 下考察了 Pt/TiO2 上吸附物种的行为，研究了 C3H6 低温 SCR 还原 NO 的反应机理。结果表明，表面亚硝酰物种（Ptdelta(+)-NO 和 Ti3(+)-NO）和 Pt2(+)-CO 是 NO、C3H6 和 O2 相互作用过程中的主要反应中间体。提出了 C3H6 低温 SCR 还原 NO 的简化 NO 分解反应机理。
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